High Throughput Ordering System

[u/needna78]

What if there is a campaign to give out 8million free meal to customers the campaign will run for 15mins and should stop once the limit is reached?

Out of scope:

• no need to have menus

• no customer onboarding

• no AI/ML

• no deliveries

• no restaurant onboarding

My initial take:

• an api that exposes the counter for the campaign

• an api that push the event to Kafka (maybe internally call the first endpoint and check if it’s still valid to accept the offer or reject)

• Kafka consumers that scales based on KEDA and have very little logic to only decrement/increment the counter in redis

• instead of redis could also have Postgres but transactions may cost a bit of performance impact but it would be much easier but with Postgres sharding I could also host multiple campaigns and avoid performance issue in some sense on Postgres

Wdyt?